"..the decoding, synchronising and binarisation of MPEG audio data,.."

I thought 'binarisation' (binarization) was a technique applied to images to give you a black and white (0 or 1) image. Very useful when applied to scanned text documents or for use in automated vehicle number plate readers, etc.

How would they use binarisation on audio data?

They are referring to the process of converting the audio data into its binary representation which is then read by the computer hardware.

"..the process of converting the audio data into its binary representation which is then read by the computer hardware."

That is what is usually known as binary conversion/encoding. It's not patentable in itself, I was doing that back in the mid '70's. The words used all describe operations on existing digital (i.e binary encoded) data.

I suspect they have done some 'definition creep' to the word 'binarisation' to mean......whatever they want it to mean.